IWAKI PUMPS MXM Series, Instruction Manual

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Installation
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Discharge line
1. Discharge line bore
When a discharge line is long but its bore is equal to the pump outlet bore, the specified performance
may not be obtained because pipe resistance becomes high. Calculate pipe resistance in advance to
decide a discharge line bore.
2. Gate valve installation
Install a gate valve on a discharge line to adjust flow rate and protect the motor from overload. Install
check valve as necessary, the optimum installation order is : Pump → Check valve → Gate valve.
3. Discharge valve installation
A discharge valve should be positioned about 1m away from the pump. An air vent line should be mount-
ed near the valve in order to prevent air from remaining.
4. Pressure gauge
Install a pressure gauge on a discharge line to check a discharge capacity and delivery head.
5. Check valve
Install a check valve in the following cases.
• Discharge line is longer than 15m.
• A delivery head is higher than 15m.
• The distance between a liquid level in a supply tank and the top end of a discharge line is 9m or longer.
• Two pumps run in parallel.
6. Air vent line
Lay on an air vent line on a discharge line when the horizontal line length is longer than 15m or more.
7. Drain
Install a drain valve as necessary (to prevent liquid from freezing in the pump, etc.).
8.
Piping support
Use metal supports so that the pump is not subject to piping weight or thermal stress.
9. Priming line
Lay on a priming line on a discharge line in suction lift application.
3. Wiring
Electrical works or wiring must be carried out by a qualified person according to local laws or regulations.
• Use the electromagnetic switch which conforms to the motor specifications of voltage and capacity etc.
• When installing the pump out of doors, take a measure to prevent rain water from getting into the switch.
• Install the electromagnetic or the push-button switch apart from the pump.
*See the instruction manual of the motor manufacturer for the motor detail.